Information on the current situation, as of 22 November 2022
Viral load in wastewater, Switzerland and Liechtenstein, 07.02.2022 to 21.11.2022
Wastewater samples are collected from wastewater treatment plants three to six times per week. The absolute viral load (gene copies/day) is specified per 100,000 inhabitants. A dilution factor based on the wastewater treatment plant's flow volume is taken into account, for instance during dry periods. The relative viral load is the measured viral load (gene copies/litre) as a proportion of the historically measured maximum value. The proportion of relative viral load is calculated by dividing the proportion of absolute viral load by the proportion of the historic maximum viral load value. The residential population comprises the catchment area of each wastewater treatment plant (WWTP). Seasonal fluctuations in the non-permanent population, which influence the viral load particularly in busy tourist areas, are not included. Wastewater treatment plants (WWTP) no longer participating in the project will not be included when calculating the proportion of viral load per category. However, historical measurements will still be available when viewing the development over time.
Detailed information on the measuring methods and terminology can be found on the Eawag website. New findings may lead to changes in the calculation of the data. Recently, the time frame desired can be selected with the slider below the graph.
Switzerland and Liechtenstein
|Relative viral load||Number of WWTP||Proportion of WWTP|
Relative viral load (7-day average)
Geographic distribution over time
View the development of the virus load in wastewater at various WWTPs in Switzerland and Liechtenstein.Explore